Improvement in heaters



D. SULLIVAN.

Heater. r

Patented June 25, 1878.

UNITED STATES PATENT OFFICE.

DANIEL SULLIVAN, OF BANGOR, MAINE.

IMPROVEMENT lN HEATERS.

Specification forming part of Letters Patent No. 205,304, dated June 25,1878 application filed May 13, 187B.

To all whom it may concern:

Be it known that I, DANIEL SULLIVAN, of

- Bangor, in the county of Penobscot and State which form a part of thisspecification, and in which-is shown a longitudinal section of myinvention.

My invention relates to an improvement in heaters; and consists of aboiler, substantially of the construction hereinafter described,suitably cased, and adapted to be used either as a steamgenerator, forheating by steam by the usual radiators, or as a hot-air heater, the airbeing heated from boiling water, and distributed by pipes and registers,as in the ordinary hot-air furnace, or as both combined.

It will be understood by reference to the accompanying drawing.

At a is shown the fire-chamber, provided with fire-tubes b, which extendthrough a water-back, 0, into a fire-back, 01, leading into a flue, e.Surrounding the fire-chamber is a casing, f, forming a water-space, 9,around it, also provided with tubes h, surrounding the tubes 1), andconnecting with the water-back 0. Over the whole is placed a steam-drumor reservoir, i, connecting at one end with the space 9, and at theother with the water-back c.

The distance between the casing f and the water-back c (greater or less,as desired) is spanned by the double tubes b h, and the whole isinclosed in a casing, j, having a coldair feeder, k, and hot-air pipes1, leading therefrom, as in the ordinary furnace.

The cold-air feeder may be provided with a damper, k, to stop thesupply.

It will be observed that the surface exposed to the fire is entirelysurrounded by a waterspace, which, in its turn, is surrounded by anair-space, to which air may be admitted or cut off, at will.

The heater may in consequence be used in three ways First, as asteam-heater, by cutting off the cold-air supply at 7c, thus preventingcondensation in the tubes, &c., and leading ul steam from the drum orreservoir 17 to the or dinary radiators; second, by cutting off thesteam-conductors n and admitting the cold air, which, entering thecasing j and circulatin g through and among the tubes and over thechamber and drum, is heated by the boiling water contained therein, andascends through the hot-air conductors and registers, as in the ordinaryhot-air furnace; third, by combining these plans and using both steamand hot air.

My heater may, of course, be provided with any ordinary and propergrates, safety-plugs, draft-regulators, &c.

The double tubes 12 h, together with the water-back c and acorresponding water-compartment at the other end, and a fire-back, d,may be combined with the common hot-air furnace, greatly increasing itsheating power and improving the quality of the hot air. In such case theback of the furnace is removed and the water-back c inserted in itsplace, the flame and heat passing through the tubes 1) to the fire-backand flue, as now.

This invention is an improvement on that for which a patent was grantedto me April 30, 1872, in which the outer casin g surrounded an ordinarysteam-boiler. In this, however, the boiler or heater is made in twosections, connected by the double tubes 11 h, which are incased andexposed to the incoming air.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In combination with a steam-boiler having a water-space surroundingall its fire-surfaces, a body consisting of uncased tubes b h,connecting its end sections and the ordinary fittings of a steam-boiler,the casingj, inclosing the whole, having a cold-air feed pipe and theordinary fittings of a hot-air furnace, both the steam-pipes and thecold-air feeder being provided with cut-offs, whereby either steam orhot air may be used for heating singly, or both combined, substantiallyas set forth, for the purposes specified.

2. In a heater having a casing, j, provided with an air-feed pipe, thedouble tubes b h, exposed within the casing to the incoming air,substantially as described, for the purposes specified.

3. A heater constructed substantially as In testimony that I claim theforegoing I have hereunto set my hand. this 8th day 0t May, 1878.

DANIEL SULLIVAN.

' Witnesses:

JOHN B. MAsoN, WM. FRANKLIN SEAVEY.

